Graphical Construction Glossary >> Concrete and Concreting. >> >> Power Float.
Above is a photo of two walk behind troweling machines, commonly called helicopters being used to finish a concrete raft slab.
The concrete after being placed, vibrated, screeded and bull floated would then be allowed to sit and to set enough so that it is almost hard enough to walk on without making a mark on the surface.
A large sit on double headed floating machine. Photo thanks to Wikipedia User:Nevsal
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